Modelling surface thermal damage to hot mill rolls

Mercado-Solis, Rafael David; Talamantes-Silva, J.; Beynon, John H.; Hernández-Rodríguez, M.A.L.

doi:10.1016/j.wear.2006.12.062

Cited by 40 publications

(19 citation statements)

References 10 publications

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“…The high temperature at the surface of the work rolls generates thermal stresses that promote surface degradation by thermal fatigue [3,4]. Additionally, the growth of an oxide layer on the surface of the rolls is favoured by the high temperature of the process and the environmental conditions in which this is developed.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation of a Work Roll Grade High Speed Steel

2011

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High speed steels are used for the manufacture of the work rolls used in hot rolling steel mills. An understanding of the degradation phenomena of work rolls is essential, particularly in fields related to the oxidation of the surface, given the importance of the surface quality of the rolled product at the end of the process and its close relation with the changes experienced by the surface of the rolls. The high temperature oxidation behaviour of a work roll grade high speed steel was studied using gravimetric means under isothermal conditions at 550 and 615°C in dry air and in a mixture of dry air and water vapour. At both temperatures, the mass gain of the samples exposed to the mixture of dry air and water vapour was considerably higher than that of the samples exposed to dry air. For all the experimental conditions, oxide growth was better described by the parabolic rate law. The composition of the oxide layer was influenced by the oxidant atmosphere, as the layer in the water vapour containing environment included an iron-chromium spinel (M 3 O 4 ), magnetite and hematite, whereas the layer in the dry air condition consisted of iron-chromium spinel, hematite and vanadium oxide. The effect of composition of the oxidant atmosphere on the rate of oxidation of the steel and the components of the oxide scale is discussed.

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Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation of a Work Roll Grade High Speed Steel

2011

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“…However, the exact geometry of the edger roll profile cannot be disclosed for reasons of confidentiality. Rolls in the hot rolling mill are composed of very hard material, such as High Speed Steel or High-Carbon High-Chromium steel [19], which maintain their hardness at elevated temperatures. Ideally, the rolls can be modeled as rigid bodies compared to the thermally softened steel slabs.…”

Section: Edger Rollmentioning

confidence: 99%

3D finite element modeling of edge and width drop behavior in hot rolling mill

Bossche¹,

Bogaerts²,

Bellemans³

et al. 2017

SCAD

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Hot rough rolling is a conventional forming process in modern steelmaking practice in which high deformations are applied to a steel slab at high temperatures. Due to the sequence of edge rolling followed by rough rolling, so-called edge and width drop phenomena are observed at the head and tail of the slab. These unwanted effects govern a yield loss and need to be minimized as much as possible. By means of a finite element study this research aims to discover the main influencing parameters on the observed edge and width drop behavior. An overview and comparison of the relative contributions of several edge rolling settings are presented. The net edger roll opening is the most important influencing parameter on edge and width drop behavior. The effect of width and thickness of the slab on the edge drop is less strongly pronounced; only the thickness influences the width drop behavior.

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“…Hence, large thermal gradient occurs near the surface, resulting in severe stresses named thermal stresses in work roll. The thermal stresses will cause some surface damages, such as wear, crack, and spalling . Moreover, another form of roll fracture known as thermal breakage originates near the roll center and spreads to the surface.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermal Breakage in Bimetallic Work Roll Considering Heat Treated Residual Stress Combined with Thermal Stress during Hot Rolling

Xia

Fang

et al. 2017

steel research int.

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Bimetallic rolls are widely used in steel rolling industry because of their excellent hardness, wear resistance, and high temperature properties. Heat treated residual stresses consist of compressive stress in the shell and tensile stress in the core are produced in the bimetallic roll during heat treatment. In the subsequent hot rolling process, severe thermal stresses are caused by heating-cooling thermal cycles at the roll surface. The combination of heat treated residual stresses and thermal stresses will cause a complex stress field in work roll during hot rolling process. The high combined tensile stress at the roll center may cause thermal breakage, once the tensile stress exceeds the material strength. Consequently, it is necessary to investigate the combined stresses to improve roll service life during hot rolling process. In this paper, the combined stresses in the work roll during hot rolling are investigated based on the FEM simulation, considering the heat treated residual stress after tempering process and thermal stress generated during hot rolling. In addition, the thermal breakage of work roll is evaluated in breakdown of water cooling systems and rolling incidents.

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Modelling surface thermal damage to hot mill rolls

Cited by 40 publications

References 10 publications

High Temperature Oxidation of a Work Roll Grade High Speed Steel

High Temperature Oxidation of a Work Roll Grade High Speed Steel

3D finite element modeling of edge and width drop behavior in hot rolling mill

Evaluation of Thermal Breakage in Bimetallic Work Roll Considering Heat Treated Residual Stress Combined with Thermal Stress during Hot Rolling

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